Dental engine



(Model.) y H. K11/[BALL Dental Engine.

NQ. 242,936. Patented Mme 14,1881.

@immensi Jnww i UNITED STATES PATENT OFFICE.

WILLIAM H. KIMBALL, OF BURLINGTON, NEW JERSEY.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 242,936, dated June 14,1881.

Application nieu December 18,1880. (Model.) 1

To all whom it may concern:

Be it known that I, WILLIAM H. KIMBALL, a citizen of the United States,residing at Burlington, in the county of Burlington, State ot' NewJersey, have invented a new and useful Improvement in Dental Engines,which improvement is fully set forth in the following specification andaccompanying drawings, in which- Y Figure l is a side elevation, partlybroken away, of the dental engine embodying my invention. Fig. 2 is aView of a portion of the opposite side.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention relates to improvements in dental engines provided withmeans for permitting the utmost freedom of manipulation of thehand-pieee, and preventing the slack of the belt or band ofthe driving-wheel, or change of tautness of the same, when said piece is movedtoward or from the place of service of the burr or tool.

The invention consists of a single standard having fitted on it asliding sleeve which carries a pulley, a hand piece or tool disconnectedfrom said standard, an endless band which is run out and carried backwith the advance and return motions of the hand-piece, a series ofpulleys, and a guiding-arm, in combination, substantially as hereinafterset forth and detinitely claimed. i

It also consists of an improved manner of operating the brake for` thedriving-Wheel.

Referring to the drawings, A represents a stand or frame, on which ismounted a power or driving wheel, B, having its axis or shaft ahorizontally arranged, and receiving power in the present case from thetreadle G, through the medium of the strap F, friction-sleeve C, andspring J, this feature, however, forming no part of the presentinvention.

H represents the base which supports the frame A and other parts of theengine.

The power of the wheel B is communicated to the endless belt or band K,which, by means of gearing b on the hand-piece L, communicates the powerto the shaft of the burr or too thereof.

On the unbroken standard A', rising from and rigidly secured to theframe A, is fitted a vertieally-slidin g and rotary sleeve, M, and abovethesame is supported a rotary cap, N, carrying three parallel pulleys,N', having horizontal axes located one above the other. An arm, P, ishinged to the cap N and provided with guides or eyes c c', the normalposition of said arm P being down and horizontal and i turns through theguide d' and guide c', then around the middle pulley N' and apulley, M',on the sliding sleeve M, thence up around the lower pulley N', and downto the Wheel B, to the starting-point.

It will be seen that the hand-piece L may be operated with the utmostfreedom in all di rectons, owing to thepivotal connection of the piecewith the yoke R, the rotation of the cap N on the rod A', and the risingandfalling of the arm P when the piece is lifted above said arm andafterward lowered. Each pair of eyes c c' d d keep the respectivelengths ot' the belt or band duly separated and parallel, and therunning of the belt is free without interference at any length. When thehand-piece is moved toward the patient or place of service, or from thestand, the .belt or band is extended, as it were, the sleeve M yieldingand rising on the standard A' for while the lengths of the belt or bandare shortened between the sleeve M and lower pulley N', they areincreased between the upper and middle pulleys N' and hand-piece L, andthus the belt or band is not actually changed, and its tautness ispreserved. When the hand-piece is moved toward the stand the weight ofthe sleeve M immediately draws down the belt or band passing around thepulley M' and takes up the slack thereof, whereby the tautness andservice of the belt or band are preserved. 4

S represents a brake, which is adapted to bear against the wheel B, andits stem passes vertically through openings in the lower por- IOO tionof the bottom standard of the frame A. The base H is hollow, and in thesame is fitted a lever, T, which extends longitudinally andhorizontally, and has one end connected to the lower end of the stem ofythe brake. A spring, V, bears against the base H and the end of thelever T opposite to the brake-stem. It will be noticed that when theengine is not in service the outer end of the base His elevated by thespring V, so as not to touch the loor. In this position the end of thelever T adjacent to the spring is forced downwardly against the Hoor,and causes its other end to elevate the brake andV press its headagainst the wheel B. When the engine is required to be run the weight orpressure of the foot of the operator on the base H causes the elevatedend of the latter to lower, the foot e acting as a fulcrum, and thespring-pressed end of the lever T is caused to rise, thus lowering thebrake and clearing the head of the wheel B. When the operator leaves thetreadle the spring V elevates the base and lowers the lever T, thusimmediately operating the brake and quickly stopping the engine.

I am aware that it is not new to pass an endless band around a pulleywhich may be raised and lowered on a standard; but in such case the bandcannot be run outand taken in with the advance and return motions of thehand piece or tool, as in my device.

I am also aware that it is not new to employ an endless band which maybe run out and l taken in with the advance and return motions of thehand piece or tool; but the provision of holding the band taut is bymeans of a telescopic standard, which is obviated by my construction'.

I am also aware that it is not new to provide the hand piece or toolwith guides for the endless band, and that dental engines have beenprovided with hinged arms; butI am not aware that any such engine has anarm which carries guides for a running-out and taking-in band, and maybe raised when the hand piece or tool is lifted above it; nor am I awarethat any engine has a running-out and taking-in band, with guide-rollersand a tighteniu g-pulley, and a single or unbroken standard whichsustains the tightening-pulley, the rotary cap which carries the guiderollers or pulleys and the hinged arm, and allows both a short andsingle vertically-immovable standard to be employed, as in my invention,wherefore I present novel and valuable features.

Having thus ldescribed my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1.- The single standard A', with the sleeve M sliding thereon, andcarrying the pulley M', the driving-wheel B, the running-out and taking-in endless band K, passing from the standard to the hand piece or toolL, which is unattached to the standard, combined and operatingsubstantially as and for the purpose set forth.

2. The standard A', sliding sleeve M, with pulley M', endless band K,driving-wheel B, and unattached hand piece or tool, in combination withthe three pulleys N' N' N', having horizontal axes, one above the other,connected to the cap N, which is rotatable upon the standard A',substantially as and for the purpose set forth.

3. The standard, in combination with the hinged arm I), provided withthe two guides c c', the endless band K, and the hand piece or tool,substantially as and for the purpose set forth.

4. The standard A', sliding sleeve M, with pulley M', the running-outand taking-in endless baud K, driving-wheel B, the pulleys N' N' N', armP, with guides c c', and the unattached hand piece or tool L, combinedand operating substantially as and for the purpose svt forth.

5. In a dental engine, the combination, with the driving-wheel, of abrake and the Vstand or frame having a rising and fallingsupporting-base, the brake being operated by said base, substantially inthe manner and for the pu rpose set forth.

6. The driving-wheel B and brake S, with connected lever T, incombination with the base H, having afulcrum-foot, e, and the spring V,substantially as and for the purpose set forth.

WM. H. KIMBALL.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. GRANT.

